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library(Matrix)

#### Automatically display the class inheritance structure
#### possibly augmented with methods

allCl <- getClasses("package:Matrix")

## Really nice would be to construct an inheritance graph and display
## it.  The following is just a cheap first step.

cat("All classes in the 'Matrix' package:\n")
for(cln in allCl) {
    cat("\n-----\n\nClass", dQuote(cln),":\n      ",
        paste(rep("~",nchar(cln)),collapse=''),"\n")
    ## A smarter version would use  getClass() instead of showClass(),
    ## build the "graph" and only then display.

    showClass(cln)
}

cat("\n\n")

## One could extend the `display' by using (something smarter than)
## are the "coerce" methods showing more than the 'Extends' output above?
cat("All (S4) methods in the 'Matrix' package:\n")
showMethods(where="package:Matrix")